通过浮选试验、动电位测试、接触角测量和红外光谱分析研究一种新型环保抑制剂聚天冬氨酸(PASP)对白钨矿和方解石的抑制作用.结果表明,与传统抑制剂酸化水玻璃相比较,PA S P具有更强的抑制能力和选择性.当pH˃6时,采用6 mg/L PASP和20 mg/L NaOL可以实现白钨矿和方解石的浮选分离.当PASP存在时,加入NaOL后方解石表面的动电位几乎无变化,且接触角大幅降低,表明PASP降低NaOL在方解石表面的吸附.相反,PASP对NaOL在白钨矿表面的吸附无明显影响,这一结果也通过红外光谱分析进一步证实.
A novel green depressant for flotation separation of scheelite from calcite
Polyaspartic acid (PASP) was used as a novel environmental-friendly depressant, and its inhibition effect on flotation performance of scheelite and calcite using sodium oleate (NaOL) as a collector was investigated by ways of flotation experiments, zeta potential measurement, contact angle measurement and infrared spectroscopic analysis (IR). The results show that PASP exhibits stronger inhibition capability and selectivity than acidified water glass, and the flotation separation of scheelite from calcite can be realized in the presence of 6 mg/L PASP and 20 mg/L NaOL at pH˃6. In the presence of PASP, the zeta potential of calcite surface almost keeps unchanged after adding NaOL, and the contact angle decreases sharply. Therefore, it is indicated that PASP significantly decreases the adsorption of NaOL on calcite surface. By contrast, it has no distinct effect on the adsorption of NaOL on the scheelite surface, which is further confirmed by IR results.
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